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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748//// malloc_base.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Implementation of _malloc_base(). This is defined in a different source file// from the malloc() function to allow malloc() to be replaced by the user.//#include <corecrt_internal.h>#include <malloc.h>#include <new.h>
// This function implements the logic of malloc(). It is called directly by the// malloc() function in the Release CRT and is called by the debug heap in the// Debug CRT.//// This function must be marked noinline, otherwise malloc and// _malloc_base will have identical COMDATs, and the linker will fold// them when calling one from the CRT. This is necessary because malloc// needs to support users patching in custom implementations.extern "C" __declspec(noinline) _CRTRESTRICT void* __cdecl _malloc_base(size_t const size){ // Ensure that the requested size is not too large: _VALIDATE_RETURN_NOEXC(_HEAP_MAXREQ >= size, ENOMEM, nullptr);
// Ensure we request an allocation of at least one byte: size_t const actual_size = size == 0 ? 1 : size;
for (;;) { void* const block = HeapAlloc(__acrt_heap, 0, actual_size); if (block) return block;
// Otherwise, see if we need to call the new handler, and if so call it. // If the new handler fails, just return nullptr: if (_query_new_mode() == 0 || !_callnewh(actual_size)) { errno = ENOMEM; return nullptr; }
// The new handler was successful; try to allocate again... }}